Do you recognize this man? He was found stabbed to death outside Frisco in December 1988 near what is now called Eldorado Parkway. But investigators never figured out his identity and are now, for the second time, reaching out to the public for help.

Lt. John Norton of the Collin County Sheriff's Office said investigators were looking through old files recently when they found the murder case. It is one of only two or three cold cases that the office has, he said, and investigators decided to do some digging.

The man was found in a creek bed under a bridge. Investigators compiled a sketch and released it to local media, but nobody ever claimed him. Without any information about the victim, detectives had few leads to follow. The case went cold and disappeared into the records.

Now, they hope that circumstances have changed and someone will come forward with information. Working with the Texas Rangers, they updated the artists rendering -- yes, that image is a rendering, not a photograph -- and hope that it will make him more recognizable. Or, maybe circumstances have changed and someone will be more willing to step forward to identify him, Norton said.

Detectives believe the man was between 15 and 25 years old. He was about 5 feet 1 inch tall and 104 pounds. They don't know whether he lived in this Collin County area.

If anyone has information about the case, they are asked to call 972-547-5350.